Github user vasia commented on the pull request:

    https://github.com/apache/flink/pull/847#issuecomment-118173012
  
    Hi @shghatge! Thank you for the update :)
    
    I left some comments inline. There are still some formatting issues in the 
code. Please, carefully go through your changes and try to be consistent. Also, 
there are still several warning regarding types, unused annotations, unused 
variables. Can you please try to remove them? Your IDE should have a setting 
that gives you the list of warnings.
    
    Regarding the tests, better create new test files for your methods, since 
you need to test with files and currently other tests use `collect()`.
    
    Finally, I find the `types()` methods a bit confusing. Could we maybe have 
separate types methods for the vertices and edges? e.g. `typesEdges(keyType, 
valueType)`, `typesEdges(keyType)`, `typesVertices(keyType, valueType)` and 
`typesVertices(keyType)`?



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